I found this to work with openvpn via the network manager:

I don't know if the message is directly telling you this (it doesn't
seem to), but it turns out that for some reason the Network Settings
doesn't save your password. Look in /etc/NetworkManager/system-
connections/ for a file that matches the name you gave your vpn in the
settings. In my case it was just called 'client'. Open it as root in an
editor.

sudo emacs /etc/NetworkManager/system-connections/client
Then change this line in the [vpn] section:

password-flags=1
to

password-flags=0
Then add this section.

[vpn-secrets]
password="your-password"
Where "your-password" is your vpn password. The quotation marks around your 
password are required.


From:

https://necromuralist.github.io/posts/openvpn-on-ubuntu-1804/

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https://bugs.launchpad.net/bugs/1725779

Title:
  Gnome network manager cannot find authentication binary

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